| Compound | lnm | u− (cm−1) | (emaxmolar−1∙L∙cm−1) | Electronic transition | Suggested structure |
| (HL) | 276 | 36,231 | 1885 | p ® p* | - |
| 346 | 28,901 | 614 | n ® p* | ||
| 362 | 27,624 | 500 | n ® p* | ||
| [Mn(HL)2(N3)2(H2O)2]∙H2O | 297 | 33,670 | 2370 | Intra-ligand | Oh |
| 345 | 28,986 | 2042 | Intra-ligand | ||
| 359 | 27,855 | 1324 | Intra-ligand | ||
| 475 | 21,053 | 208 | 6A1g ® 4T2g(G) | ||
| 638 | 15,674 | 41 | 6A1g ® 4T1g(G) | ||
| 794 | 12,594 | 7 | 6A1g ® 4Eg(D) | ||
| [Co(HL)2(N3)2]∙2H2O | 286 | 34,965 | 2304 | Intra-ligand | oh |
| 345 | 28,986 | 2034 | Intra-ligand | ||
| 362 | 27,624 | 1228 | Intra-ligand | ||
| 650 | 15,387 | 13 | 4T1g ® 4A2g | ||
| 879 | 11,377 | 4 | 4T1g ® 4T2g | ||
| [Ni(HL)2(N3)2]∙3H2O | 281 | 35,587 | 2218 | Intra-ligand | Oh |
| 347 | 28,818 | 1152 | Intra-ligand | ||
| 365 | 27,397 | 842 | Intra-ligand | ||
| 426 | 23,474 | 323 | 3A1g ® 3T2g(P) | ||
| 792 | 15,942 | 10 | 3A1g ® 3T1g | ||
| 879 | 11,377 | 2 | 3A1g ® 3T2g | ||
| [Zn(HL)2(N3)2]∙3H2O | 286 | 34,965 | 2278 | Intra-ligand | Oh |
| 345 | 28,986 | 1489 | Intra-ligand | ||
| 354 | 28,249 | 962 | Intra-ligand | ||
| [Cd(HL)2(N3)2]∙2H2O | 286 | 34,965 | 2276 | Intra-ligand | Oh |
| 345 | 28,986 | 1485 | Intra-ligand | ||
| 354 | 28,249 | 960 | Intra-ligand | ||
| [Hg(HL)2(N3)2]∙3H2O | 284 | 35,211 | 2274 | Intra-ligand | Oh |
| 345 | 28,986 | 2085 | Intra-ligand | ||
| 354 | 28,249 | 1266 | Intra-ligand |